Abstract:The health and safety of marine ecosystems are directly related to the health and well-being of all mankind. Factors such as insufficient effective monitoring data and lack of scientific decision-making information have affected the smooth implementation of the marine sustainable development goals (SDG 14) to a certain extent. Big Earth Data possesses macroscopic, dynamic and objective monitoring capabilities, and can play an important role in supporting the realization of the sustainable development goals of the ocean. With the support of the Strategic Priority Research Program of Chinese Academy of Sciences, and based on technologies and methods related to Big Earth Data, China has effectively carried out specific practices such as the production of missing ocean data sets and the construction of target localization models. Based on the above analysis, the study puts forward suggestions such as actively participating in the sharing of Big Earth Data in the international community, strengthening the drive of scientific and technological innovation in the realization of sustainable marine development goals, and deep participation in the United Nations Ocean Governance Plan.